ass 



OUTLINES OF PLANT LIFE. 



is very large. (For the mode by which parasitic fungi gain 

 entrance to the bodies of their hosts, see T 45-) 



Fig. 2i7.-Roots of a yellow Gerardia, C, attached to the root of a blueberry bush, B. 

 They enlarge, at the points of contact and there send haustona into the host root. 

 Natural size.— After Gray. 



370. 2. Seed plants. — A few seed plants have adapted 

 themselves to a parasitic life upon others. Some may be 



Fig. 2 8. — A, Eiu-opean dodder twining about a hop stem. All but the uppermost coils 

 show the groups of wartlike swellings from which haustoria penetrate the host stem. 



. Natural size. B, Germination of same. The various stages are arranged in order 

 from right to left. In the last stage the seedling has found a suitable support and has 

 absorbed all the reserve food in the thickened lower end, which has withered and died, 

 freeing the plant from the ground. Magnified about 2 diam. — After Kerner. 



